# U vs Z

The clearest difference is update cadence: Z at fortnightly against U's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

U ships an update every 2 months, Z fortnightly. The most recent releases landed on September 8, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | U | Z |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Size | 31 MB | 38 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Ningbo Wanyou Electronic Technology Co., Ltd.](https://appshunter.io/developer/1228091713) | [Zhongrui Green Energy Technology (Shenzhen) Co., Ltd.](https://appshunter.io/developer/1549908840) |

## What reviewers say

### U

[App page](https://appshunter.io/ios/app/u-nas-cloud/id1468870585)

**In-app purchases:** none


### Z

[App page](https://appshunter.io/ios/app/z-cloud/id6444879748)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is U free?

U is free to download, with no in-app purchases.

### Is Z free?

Z is free to download, with no in-app purchases.

### Do U or Z have ads?

Neither U nor Z shows ads.

### Which is updated more often, U or Z?

U ships an update every 2 months, and Z fortnightly. Most recently, U was updated on September 8, 2026 and Z on September 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*